LT3486EDHC 데이터 시트보기 (PDF) - Linear Technology

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LT3486EDHC

Dual 1.3A White LED Step-Up Converters with Wide Dimming

Linear Technology 

BLOCK DIAGRAM

OVP1 3

OVERVOLT

DETECTION

SW1

1

CONVERTER1

OV1

PWM

EN1

LOGIC

OSC

Q1

RSNS1

+

A3

–

RT

VIN

4

2

OSC

OSC

RAMP

GEN

LT3486

CONVERTER2

A3

SW2

16

14 OVP2

OVERVOLT

DETECTION

DRIVER

OV2

Q2

PWM

LOGIC

EN2

RSNS2

OSC

VC1 5

OV1

PWM

COMP

A2

EN1

CONVERTER1

CONTROL

8

7

PWM1 CTRL1

EA

A1

80k 20k

0.2V

REF 1.25V

SHDN

START-UP

CONTROL

0.2V

EA

+

– A1

+

20k 80k

6

13

15

11

FB1

SHDN REF

FB2

Figure 1. LT3486 Block Diagram

PWM

+ COMP

A2

–

EN2

CONVERTER 2

CONTROL

10

9

CTRL2 PWM2

12 VC2

OV2

17

3486 F01

EXPOSED

PAD

3486fe

7

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